This is what they say on the Pro Tools website (don’t shoot me lol).
"So having your 24 bit recordings in 32 bit floating point format will not change the quality of the initial recordings themselves, but creating audio files in this format before they are processed by plug-ins will help you avoid the following:
Clipping during AudioSuite rendering
Unnecessary noise introduced by AudioSuite dithering
Rounding errors during signal processing
These issues then are mostly caused by the fact that with either 16 or 24 bit audio the data requires conversion at the point of processing."
http://www.askaudiomag.com/articles/pro-tools-10-the-benefits-of-32-bit-floating-point-audio
So 24 bit files are up sampled to 32 and then back to 24 in a 32 bit plugin? That is where rounding errors etc are caused? Doesn’t it effect the file when you do an audio mixdown?